The Ground-Penetrating Radar is capable of reading the densities and other properties of the blocks below it, and from that determining what blocks lie below. This allows it to draw a cross-sectional map of caves, underground structures, and other materials. Larger power inputs will give it a wider field of view, topping out at 82 blocks wide.
Required Power: 65536W
Field-of-View = 1+2*log_2(power-65536) m
Power Input: Back